html{
  margin: 0;
  padding: 0;
  background: bisque;
}

body {
  font-family: Arial, sans-serif;
  line-height: 1.6;
}

button{
  color: red;
  padding: 8px 16px;
  border-radius: 4px;
  border: none;
  cursor: pointer;
}

/* 以下是未使用的CSS类，应该被PurgeCSS移除 */
.unused-class {
  color: blue;
  font-size: 20px;
  border: 1px solid green;
}

.another-unused-class {
  display: flex;
  justify-content: center;
  background-color: yellow;
}

.fancy-box {
  box-shadow: 0 0 10px rgba(0, 0, 0, 0.5);
  border-radius: 8px;
  padding: 20px;
  margin: 10px;
}

.big-title {
  font-size: 32px;
  font-weight: bold;
  text-align: center;
  color: purple;
}

.card {
  border: 1px solid #ccc;
  padding: 15px;
  margin-bottom: 10px;
}

.card-header {
  font-weight: bold;
  border-bottom: 1px solid #eee;
  padding-bottom: 10px;
}

.card-body {
  padding-top: 10px;
}

.btn-primary {
  background-color: blue;
  color: white;
}

.btn-secondary {
  background-color: gray;
  color: white;
}